book very last minute and don't buy their insurance pkg
The downside is that you can't get your money back once you booked; because you have to paid with credit card on line for booking it. You can buy travel cancellation insurance but that costs about $25 and add that to your great Hotwire rate, it comes out to be similar to any other good deal car rental anywhere without having to paid upfront.
But, if you book just the day before you take off, that Hotwire rate comes down even cheaper. Last month I used Hotwire for car rental at Orlando. 2 wks before my trip it was ~$15 a day. The night before I flew, it was $9. Hopefully the day before you travel is pretty certain that you will travel and not cancel.
Another downside is the car insurance package you buy when you book with them, is not recognized or honored by the car rental company. At least that was with the rental company I booked through Hotwire. At the pick up counter the agent told me whatever insurance I got from Hotwire it's not valid; only the insurance i buy directly with the car rental company is good. Not sure if he was telling the truth though.
B